Where is seamless and welded steel pipe difference? 1. Appearance, seamless and welded steel pipe inner wall welding difference in muscle, but there is no seamless. 2. The higher pressure seamless, welded pipe is generally about 10 MPa, and now have to do seamless pipe processing. 3. seamless steel pipe was rolling a molding. Welded steel pipe welded need rolled back, generally spiral welded and straight welding. Seamless performance is better, of course, price is also higher. The tube is a hollow steel bar, a large number of channels for transporting fluids, such as oil, natural gas, water, gas, steam, etc. In addition, engaged in bending, torsional strength, lighter weight, so it is widely used in the manufacture of mechanical parts and engineering structures. Also used in producing a variety of conventional weapons, the barrel, shells and so on. Classification of steel pipe: seamless and welded steel pipe points (pipe joints) two categories. Press the cross-sectional shape can be divided into tube and shaped tubes, round steel widely used, but there are some square, rectangular, semi-circular, hexagonal, equilateral triangle, octagonal shaped steel tubing. For withstand fluid pressure hydraulic pipe must withstand the test of capacity and quality profiled steel pipes, leaks do not occur at the specified pressure, wet or expansion of qualified, some steel but also according to the requirements of the standard volume or demand side side test, flaring test, flattening test. Seamless steel pipe: seamless steel ingot is made of perforated or solid through the capillary tube, and then by the hot-rolled, cold-rolled or cold call is made. Seamless steel pipe wall thickness specifications mm diameter * number indicates. Hot and cold rolled seamless steel pipe points (written) seamless steel categories. Hot-rolled seamless steel pipe sub-normal, low, medium pressure boiler pipe, high pressure boiler pipe, steel pipe, stainless steel pipe, oil cracking pipe, steel and other steel and other geological. Shandong Liaocheng Polygram Pipe Technology to provide you with the difference between the manufacturing process: galvanized steel and seamless steel pipe two kinds of areas, galvanized steel refers to a galvanized surface, there may be welded pipe, it may be no seam pipe, seamless steel pipe manufacturing process means, welded and seamless points. These corrosion resistant galvanized pipe, seamless steel pipe can withstand higher pressures. Because zinc galvanized steel protection, not easy to rust, galvanized steel seamless pipe lighter than if it is used in the balcony, it is best to use light galvanized pipe, seamless steel too with less suitable for balcony Because seamless steel pipe wall thickness, naturally heavy weight on the T-pipe, seamless steel pipe and galvanized steel than the cost of higher costs, as well as galvanized steel is very durable, far more than the useful life of seamless steel tubes. If the quality, the use of twenty years should not be a problem, of course, have to do the welding and painting, not to affect the life of galvanized steel. Uses difference: galvanized steel in general is used to make fences, fence, fence, balcony fence. Widely used in municipal engineering, roads, factories, schools, development zones, gardens, squares, residential and other places. Thick-walled seamless steel high-pressure principle principle thick walled high pressure seamless steel high pressure seamless steel pipe production works. High-pressure boiler cares includes the following steps: Step 1 steel, material preparation; step two, tube heating and rotary piercing; step three, capillary dressing; Step four, thermal expansion deformation sizing; Step five, heat treatment; step six, Jiao Straight; step seven, the mill; step eight, correction; step nine, outside grinding; Step 10, flaw detection; 11 steps, then finishing, final inspection and packaging. The present invention can be produced only in the range of a large group from the high-grade alloy seamless steel pipe, and the investment is relatively small, high product quality, high production efficiency, lower production costs. The main production process high pressure boiler steel tube and billet heating, perforated tube, pipe extension, rolling steel pipe, pipe sizing and reducing, cooling and finishing steel or can be said heating hot steel perforated embryos cold drawn carbon burning rolled pickling spray head cut packaging products manufacturing method of a flat oval pipe oil cracking pipe, wherein: the rolling base set will have more than one roll to the rolling direction different from each other in a row configure multiple mandrel mill, after such a manufacturing production line rolling of seamless steel pipe, steel pipe wall thickness was measured in the circumferential direction after rolling on the multi-point, according to the measurement results, at least both end positions of the respective axes are controlled mandrel mill of the final rolling mill roll the base station, so uneven wall thickness to a minimum. Wall thickness error is relatively large walled alloy seamless steel pipe _ T-shaped steel handrail (certified) _ steel supplied by Polygram Liaocheng Steel Pipe Manufacturing Co., Ltd .. Shandong Liaocheng Polygram Pipe Manufacturing Co. (www.lcbljgg.com) (www.lcbljgg.com) (www.sdlcblj.com) (www.bljggzz.com) Shandong Liaocheng, wire, pipe, plate manufacturing equipment leaders, over the years, the company implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Polygram steel leader with the staff warmly welcome all inquiries negotiations to create Polygram steel a better future.